JPH02259398A - Pulse laser optical detector device - Google Patents

Abstract

PURPOSE:To provide a title device suitable for detection of various laser lights by providing an optical detector element, a signal processing circuit, an image processing circuit, and display means for displaying detection position of a laser light on a diffusive screen detected by said image processing circuit. CONSTITUTION:A title device comprises a video camera 32 equipped with a variable electronic shutter mechanism, an optical detector for effecting light-electric signal conversion, a signal processing circuit 34 for receiving an output from the optical detector element, identifying information contents of coded pulse modulation of the laser light, and outputting a sync. signal to the variable electronic shutter of the video camera 32, and an image processing circuit 35 for receiving the information contents of the laser light, identifying the same, and detecting the optical detection position of the laser light on a diffusion screen 31. The detection position of the laser light on the diffusive screen 31 detected by the image processing circuit 35 is displayed on a monitor television 36. Therefore, there is assured a function of the improvement of detection resolution by the video camera 32 and the identification of the information contents of the laser light by the optical detection device when receiving the laser light subjected to the coded pulse modulation, also for a plurality of received optical inputs.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Field of Industrial Application) The present invention is directed to a gun equipped with a transmitter that uses laser light instead of a live bullet or a simulated bullet, or a gun with an equivalent function. The present invention relates to a pulse laser light receiving device such as a target device for target practice using a simulated gun.

(Prior Art) In general, there is a first method of light receiving devices in which the received laser light is directed onto a diffusion screen placed in front of a video camera, the transmitted light is captured by the video camera, and the image is displayed on a monitor television or the like.

In addition, instead of a diffusion screen and a video camera, a light-receiving element board with light-receiving elements mounted horizontally and vertically receives the laser light, performs optical-to-electrical signal conversion, amplifies the weak signal, and then uses a comparator to determine the light-receiving level. There is a second method in which a judgment is made and the received light output signal is converted into coordinates by a matrix circuit and the light receiving position is displayed by a light emitting diode or the like.

A functional block diagram of the first method described above is shown in FIG. That is, this means that the diffusion screen 1 is placed in front of the video camera 12.
For this diffusion screen 11,
The transmitted laser light is photographed by a video camera 12, and the image is displayed on a monitor television 14 through a control circuit 13. This first method has the disadvantage that an image cannot be displayed unless the received laser light is temporally continuous. In addition, even if the light is received continuously, if there is a positional shift when receiving the light, there will be an error in the light receiving position, and even if multiple laser beams are received, each signal cannot be separated, so accurate A function to detect the light receiving position and to handle multiple light receiving signals is required.

Next, a functional block diagram of the second method is shown in FIG.

That is, a light receiving element substrate 2 on which light receiving elements are mounted horizontally and vertically.
1 directly receives the laser beam, converts it into an electric signal, and then sends the amplifier 22 . Comparator 23. The light passes through a matrix circuit 24, and the light receiving position is displayed by a light emitting diode 25 corresponding to the light receiving element.

In this second method, the light-receiving resolution of the light-receiving element substrate 21 on which the light-receiving elements are mounted horizontally and vertically is determined by the mounting position and number of the light-receiving elements, so the number of mounted elements must be increased as the resolution of the light-receiving position is increased. There must be. As for the amplifier 22, since one amplifier is required for one light receiving element, a large number of amplifiers becomes necessary as the light receiving resolution improves. Regarding the comparator 23, one comparator is required for one amplifier, and peripheral components such as a variable resistor are also required for setting and adjusting the threshold value.

The matrix circuit 24 is a circuit that converts the comparator output into X-axis and Y-axis outputs.

The light emitting diode 25 displays the output of the matrix circuit, and in this case, the light emitting diode in the area where the comparison output is made based on the threshold value of the comparator 23 lights up to display the light receiving position.

In addition, in this second method, improving the light reception resolution of the laser beam leads to an increase in the size of the device, and there is a resolution limit due to the physical spacing of the light receiving elements, and there is a drawback that it cannot handle multiple light receptions. be.

As described above, in the conventional system, even if an attempt was made to grasp the light receiving position and the contents of the light receiving data after receiving one coded laser beam, only the light receiving position could be displayed. Furthermore, the amplifier
Since a large number of linear ICs such as comparators are used, it is important to reduce current consumption and improve reliability.

(Issue 8 to be solved by the invention) The present invention eliminates the above-mentioned drawbacks, and uses a video camera with a variable electronic shutter mechanism and a light-receiving element with a fast response speed to receive coded pulse modulation. 1 laser beam, the video camera can improve the resolution of the laser beam, and the photodetector can identify the information content of the laser beam at the same time.
Moreover, it is an object of the present invention to construct a pulsed laser light receiving device that has a function for receiving a plurality of light receiving inputs.

[Structure of the Invention] (Means and Effects for Solving the Problems) In order to achieve the above object, the present invention provides a variable electronic system in which a coded pulse-modulated laser beam is transmitted through a diffusion screen and received. A video camera with a shutter mechanism, a light-receiving element that performs optical-to-electrical signal conversion, and the output of the light-receiving element is applied to identify the information content of coded pulse modulation of laser light and operate the video camera for a certain period of time. A signal processing circuit outputs a synchronizing signal to the variable electronic shutter of the video camera, and the information content of the laser light from this signal processing circuit is read and identified, and the image signal from the video camera is added to the diffuser screen. an image processing circuit that detects the receiving position of the laser beam;
A video camera having a variable electronic shutter mechanism and a light-receiving element with a fast response speed. is used to receive coded pulse-modulated laser light, allowing the video camera to improve the light receiving resolution and the light receiving element to identify the information content of the laser light at the same time, and also for multiple light receiving inputs. It is a function to perform the function.

(Example) Hereinafter, one example of the present invention will be described with reference to the drawings.

A video camera 32 with a variable electronic shutter mechanism shown in FIG. 1 corresponds to the light receiving element substrate 21 shown in FIG. 3 on which light receiving elements are mounted horizontally and vertically. I am using it. Third
In contrast to the system shown in the figure, in which the laser beam is directly received by the light receiving element, in this apparatus, the laser beam that has been subjected to coded pulse modulation is received by the diffuser screen 31 in front of the video camera 32.

By using the video camera 32, laser light can be received without using a large number of light receiving elements, amplifiers, and comparators, and the resolution of the light receiving position can also be varied by setting the image processing circuit 35.

By utilizing a variable electronic shutter function that is not present in the video camera 12 of FIG. 2, it is possible to accurately detect the light receiving position using a set of coded pulse-modulated laser beams. This is because the video camera 32 is operated instantaneously only when one laser beam is received, thereby effectively eliminating the fluctuation of the laser beam and enabling accurate measurement.

A light-receiving element board 33 made of a light-receiving element with a fast response speed that performs optical-to-electrical signal conversion outputs coded information of the received laser light to a signal processing circuit 34 . Since this light receiving element substrate 33 is not used for the purpose of detecting the light receiving position, only one light receiving element board 33 is required. The signal processing circuit 34 identifies the information content of the coded pulse modulation of the laser beam output from the light receiving element and outputs it to the image processing circuit 35. The signal processing circuit 35 also outputs a timing signal (synchronization signal) for operating an internal gate circuit with the first pulse of the laser beam and operating the variable electronic shutter of the video camera 32. This timing signal causes the video camera 32 to operate for a certain period of time and read only the second light reception pulse, thereby making it possible to accurately identify the light reception position even if the laser light on the diffusion screen 31 is slightly shifted.

The image processing circuit 35 calculates the center of gravity of the light receiving position of the diffuser screen 31 from the image signal of the video camera 32 and displays it on a monitor television 36 etc., and also reads and identifies the information content of the laser beam, so that it can detect various types of laser beams at the same time. It is possible to receive light, and the processing ability regarding the light receiving position and information content is improved. In other words, this method has the advantages of a light-receiving element with a fast response speed but acceptable resolution, and a video camera with excellent resolution but poor signal processing ability, and eliminates the disadvantages. This improves the performance of the light receiving position detection and light receiving information identification device.

In the embodiment shown in FIG. 1, the light-receiving element board 33 for taking in information about the laser beam is incorporated into the optical section together with the video camera 32, but it may be provided externally as long as it can receive the laser beam.

Furthermore, if the relationship between the diffusion screen 31 and the video camera 32 is fixed, other image processing circuits 35, monitor televisions 36
etc. may be built into the optical section. In addition, monitor TV 3
It goes without saying that 6 may use other display means, such as a liquid crystal display or a plasma display.

[Effects of the Invention] As described above, according to the present invention, the receiving position of one laser beam can be detected with high resolution, and coded information can also be identified at the same time. A pulsed laser light receiving device suitable for receiving light can be provided.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing a pulsed laser receiving device using a conventional video camera, and Fig. 3 is a pulsed laser receiving device using a conventional photodetector. FIG.

Claims (1)

[Claims] A video camera with a variable electronic shutter mechanism that receives coded pulse-modulated laser light after passing through a diffusion screen, and a light-receiving element that performs optical-to-electrical signal conversion;
a signal processing circuit that identifies the information content of the coded pulse modulation of the laser beam to which the output of the light receiving element is applied, and outputs a synchronization signal to the variable electronic shutter of the video camera so as to operate the video camera for a certain period of time; , an image processing circuit that reads and identifies the information content of the laser beam from the signal processing circuit, adds an image signal from the video camera, and detects the receiving position of the laser beam on the diffusion screen; 1. A pulsed laser light receiving device comprising display means for displaying a laser light receiving position on a diffusion screen detected by a circuit.